Captures his second consecutive IndyCar Series Championship by edging out future Penske teammate Helio Castroneves by just 20 points, while driving the No. 4 Pennzoil Panther Dallara/Chevrolet. Records closest finish in IndyCar Series history by defeating Al Unser Jr. by 0.0024 seconds at Chicago. Scores a record five wins and ties Buddy Lazier for most career victories with eight. Leads IndyCar Series in laps led by leading 654 out of 3,100 possible laps.